In Spring Boot, which framework is primarily used for mocking objects in unit tests?
- EasyMock
- JUnit
- Mockito
- TestNG
Mockito is a popular framework used for mocking objects in unit tests in Spring Boot applications. It allows you to create mock objects and define their behavior during testing.
In unit testing of Spring Boot applications, the _____ method of Assert class is commonly used to check if the specified condition is true.
- assertEquals
- assertFalse
- assertNull
- assertTrue
In unit testing of Spring Boot applications, the assertTrue method of the Assert class is commonly used to check if the specified condition is true. This is helpful for verifying that a certain condition or assertion holds true during the test.
Which Spring Cloud component is primarily used for service discovery in a microservices architecture?
- Spring Boot
- Spring Data
- Eureka
- Hibernate
The primary Spring Cloud component used for service discovery in a microservices architecture is Eureka. Eureka is a server-based service registry that allows microservices to register themselves and discover other services in the system.
What is the significance of the “spring.factories” file in creating custom Auto Configuration?
- It configures database connection properties for Spring Boot applications.
- It lists all the dependencies required for a Spring Boot application.
- It provides metadata to Spring Boot about custom Auto Configuration classes.
- It specifies the primary bean to be used when there are multiple candidates.
The "spring.factories" file is significant in creating custom Auto Configuration in Spring Boot as it provides metadata to Spring Boot about custom Auto Configuration classes. This file lists the fully qualified names of the Auto Configuration classes that should be loaded and applied when your application starts. It's a crucial part of the automatic configuration process.
What is the primary purpose of configuring a Data Source in a Spring Boot application?
- To define the application's main class.
- To configure the application's logging.
- To manage the application's dependencies.
- To establish a connection to a database.
Configuring a Data Source in a Spring Boot application is primarily done to establish a connection to a database. This is crucial for applications that need to interact with a database to store or retrieve data. While the other options are essential in a Spring Boot application, they are not the primary purpose of configuring a Data Source.
The _____ endpoint in OAuth2 is used by the client to obtain an access token.
- /access
- /auth
- /authorize
- /token
In OAuth2, the /token endpoint is used by the client to obtain an access token. The client exchanges its credentials or authorization code for an access token at this endpoint, allowing it to access protected resources on behalf of the user.
You are tasked with optimizing the load balancing strategy used by Ribbon in your Spring Cloud application. How would you approach customizing Ribbon’s behavior to ensure optimal distribution of requests?
- Deploy a dedicated load balancer (e.g., Nginx) in front of your Spring Cloud application to handle load balancing. Configure Ribbon to perform health checks on service instances and route traffic accordingly.
- Implement a custom IRule in Ribbon to define a load balancing strategy tailored to your application's needs. Consider factors like service health, latency, and client performance. Monitor and adjust the strategy based on real-time metrics.
- Use a weighted round-robin strategy for load balancing. Enable server-side load balancing using Spring Cloud Gateway. Implement exponential backoff retries for failed requests. Use the Least Connections strategy to minimize server load.
- Use the default Round Robin strategy as it provides equal distribution of requests. Implement client-side retries for fault tolerance. Configure a static list of servers for each client to maintain control over the request distribution.
Customizing Ribbon's behavior for optimal load balancing involves implementing a custom IRule that considers various factors such as service health, latency, and client performance. Real-time monitoring and adjustments based on metrics ensure the load balancing strategy remains effective. This approach allows you to fine-tune load balancing for your specific application requirements.
Which utility is commonly used in Spring Boot for performing HTTP requests in test scenarios?
- DataSource
- JdbcTemplate
- MockMvc
- RestTemplate
MockMvc is a widely used utility in Spring Boot for performing HTTP requests in test scenarios. It provides a convenient way to write unit tests for Spring MVC controllers and is often used for integration testing in Spring Boot applications.
The _____ file is crucial for defining custom Auto Configuration classes in Spring Boot.
- AutoConfiguration.java
- application.properties
- application.yml
- autoconfigure.properties
The "AutoConfiguration.java" file is crucial for defining custom Auto Configuration classes in Spring Boot. This is where you can define your own auto-configuration classes to customize the behavior of Spring Boot's auto-configuration process. Custom Auto Configuration classes are typically Java classes, and this file plays a central role in configuring them.
When using @PostAuthorize in Spring Security, the access control decision is made after the _____ has been invoked.
- controller
- method
- repository
- service
When using @PostAuthorize in Spring Security, the access control decision is made after the method has been invoked. This annotation allows you to specify additional checks on the return value of the method.